<template>
  <div>
     <div v-for="(item,index) in arr" :key="index" style="display: inline-block">
       <input type="checkbox" v-model="num" :value="item"> {{ item }}
     </div>
     <br>
     <p>你选中的原素累计和为：{{ sum }}</p>
  </div>
</template>

<script>
export default {
   data() {
    return {
      arr :[9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      num : []
    }
   },
   computed:{
    sum() {
      return this.num.reduce((prev,item) => prev + item,0)
    }
   }
}
</script>

<style >
 
</style>